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Title: Ongoing slow oscillatory phase modulates speech intelligibility in cooperation with motor cortical activity
Authors: Onojima, Takayuki
Kitajo, Keiichi
Mizuhara, Hiroaki  kyouindb  KAKEN_id
Author's alias: 小野島, 隆之
北城, 圭一
水原, 啓暁
Issue Date: 11-Aug-2017
Publisher: Public Library of Science (PLoS)
Journal title: PLOS ONE
Volume: 12
Issue: 8
Thesis number: e0183146
Abstract: Neural oscillation is attracting attention as an underlying mechanism for speech recognition. Speech intelligibility is enhanced by the synchronization of speech rhythms and slow neural oscillation, which is typically observed as human scalp electroencephalography (EEG). In addition to the effect of neural oscillation, it has been proposed that speech recognition is enhanced by the identification of a speaker’s motor signals, which are used for speech production. To verify the relationship between the effect of neural oscillation and motor cortical activity, we measured scalp EEG, and simultaneous EEG and functional magnetic resonance imaging (fMRI) during a speech recognition task in which participants were required to recognize spoken words embedded in noise sound. We proposed an index to quantitatively evaluate the EEG phase effect on behavioral performance. The results showed that the delta and theta EEG phase before speech inputs modulated the participant’s response time when conducting speech recognition tasks. The simultaneous EEG-fMRI experiment showed that slow EEG activity was correlated with motor cortical activity. These results suggested that the effect of the slow oscillatory phase was associated with the activity of the motor cortex during speech recognition.
Rights: © 2017 Onojima et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI(Published Version): 10.1371/journal.pone.0183146
PubMed ID: 28800613
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